// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.apache.impala.extdatasource.util;

import java.math.BigDecimal;
import java.nio.ByteBuffer;
import java.sql.Timestamp;

/**
 * Utility methods for serialization by an ExternalDataSource.
 */
public class SerializationUtils {

  /**
   * Encodes a DECIMAL value.
   */
  public static ByteBuffer encodeDecimal(BigDecimal decimal) {
    if (decimal == null) throw new NullPointerException("decimal cannot be null.");
    return ByteBuffer.wrap(decimal.unscaledValue().toByteArray());
  }

  /**
   * Encodes a TIMESTAMP value.
   */
  public static ByteBuffer encodeTimestamp(Timestamp timestamp) {
    if (timestamp == null) throw new NullPointerException("timestamp cannot be null.");
    ByteBuffer buffer = ByteBuffer.allocate(8 + 4);
    buffer.putLong(timestamp.getTime() / 1000);
    buffer.putInt(timestamp.getNanos());
    buffer.rewind();
    return buffer;
  }
}
